An element has 4 isstopes, the first one has a mass of 202.9 amu and an abundance of 9%, the second isotope has a mass of 206.9 amu and an
abundance of 55%, the third isotope has a mass of 2072 aru and an abundance
of 23%, The final isotope has an atomic mass of 208,9 aru and an aburdance cf
13% Calculate the average atomic massAn element has 3 isotopes, the first one has a mass of 31.9 amu and an
abundance of 55.3%, the second isotope has a mass of 33.0 amu and an
abundance of 20.2%, the third isotope has a mass of 30.2 amu and an abundance
of 24.5%. Calculate the average atomic mass.

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.